Telephone-transmitter.



G. R. MORRIS. TELEPHONE TRANSMITTER. APPLICATION TILED JULY mug.

Patented July 2, 1912.

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' To all whom it may concern:

-UNITED STATES PATENT OFFICE.

GEORGE RALPH. MOBRIS, 0F BUFFALO, NEW YORK, ASSIGNOR- 0F ONE-THIRR T0 DAVID z. MORRIS, or TORONTO, CANADA.

TELEPHONE-TRANSMITTER.

Be it known that I, Gnonon RALPH Mon- R'Is, a citizen of the United States, residing at Buffalo, in the county of Erie and State. of New York, have invented a new and useful Improvement in Tel'ephone-Transmi tt'ers, of which the following is a specification.

This invent-ion relates to improvements in telephone transmitters or mlcrophones which depend for their operation upon variations in electrical resistance due to the action of he vibrating transmitter diaphragm or other device on a resistance \':1'

rying device, irrespective of how the vibrations of the diaphragm or device are pr oduced.

The primary object of the invention is to produce a telephone transmitter, or microphone, in which the carbon button or resistance varying device is mounted and arranget elative to the diaphragm in a novel manner so as-to regulate. the action of the telephone'and eitecta more even reproduction of sounds by augmenting the weaker and softening the stronger sounds.

Other objects of the invention are to mount the carbon'button or resistance varying device in a spring or flexible or spring frame which operates as a damperfor the diaphragm and acts centrally thereon; also to secure the button-supporting spring or 'framein the transmitter casing: in such manner that it. and the diaphragm will be free from aft strain or stress when the latter is in theuflrmal position;-also to arrange the carbon butwn or resistance varying device so that a change in -the posit-ion of the transmitter armwillnot affect the operation of the transmitter; also to produce a telephone transmitter which is of simple and inexpensive construction and can be quickly and'casily repaired; and also to improve the microphone or telephone transmitters in the respects hereinafter described and set forth in the claims.

In the accompanying drawings: Figure l is a longitudinal sectional elevation of a telephone transmitter embodying the invention. Fig. 2 is a sectional elevation thereof in line 2-2, Fig. 1. Fig. 3 is a fragmentary sectional elevation, on an enlarged scale, similar to Fig. 1. Fig. 4 is a sectional plan view thereof in line L-.4,'Fig. 1.

Like reference characters refer to like parts in the several figures Specification of Letters Patent.

Patented July 2,1912.

Application filed Jul 22, 1909. Serial No. 508,949.

A represents the casing, 13 the arm or support therefor, carbon button or of a telephone transmitter or microphone. The casing maybe of any usual or suitable term and construction, that shown in the drawings having a removable screw cap or being secured on the arm B in the usual way. The diaphragm is preferablyclamped at its edge between the body and removable cap of the casing;

The carbon button or resistance varying device D may be of ordinary construction, consisting of electrodes (1 d connected to but insulated from a receptacle at in which and. arranged relative to the diaphragm in the followin novel manner: E represents a spring or iiexiblemetal, or spring frame which is secured centrally to the diaphragm by a screw 0, or other means, and extends inwardly from the diaphragm, being rigidly secured at'its inner side in the casing in the manner hereinafter explained, so as to )revent strain or stress on the diaphragm w 181! the latter is in its normal position. The button is arranged within this spring or frame is rigidly held atits inner side the cured to the opposite sides'of the frame, whereby the button is supported with its axis at right angles to the axis.ot the diaphragm or so'thatthe electrodes more in a direction substantially parallel with the plane of the diaphragm, instead of at right angles thereto, as in the usual arrangement. f f represent the telephone conductors which are connected in any suitable way to the electrodes (Z and d. The spring or frame may be of the polygonal shape shown in the drawings, or of circular, elliptical or other suitable form. As the spring -or frame is rigidly held at its inner side the vibrations of the diaphragnror device al ternately elongate and shorten. the spring in the direction of the axis of the. button, so that the inward movements of the diaphragn'i spread the electrodes d d". apart, or decrease the pressure thereof on the carbon granules of-the button and increase the electrical resistance between the electrodes, whereas the return movements of the diaphragm press the electrodes toward each C the diaphragm, and D the resistance varying device end a provided with a mouth-piece a, and.

the carbon granules are confined between the electrodes, but the button is mounted other and decreasethe electrical resistance,

loo

I which results in materially augmenting the l of Paris, or other suitable plastic nu'iterial, 55 weak sounds and modulating the loud which burdens and fastens the bolt rigidly -soundstransmitted by the diaphragm, thus in the position which it naturally assumes, producing a regulating effect upon, or a so that the springs and diaphragm will be 5 more even reproduction of the sounds. free from all stress or strain when the dia- By mounting the carbon button in the phragm s in the normal position. spring frame inthe manner described, the The described. construction enables the movement of the electrodes may be made transmitter to be readily repaired. The diaequal to, greaterv than, or less than the cor phragm can be detached and removed by responding movement of the diaphragm, deunscrewing the screw which fastens it to the pending upon whether the length of the button-supporting spring and the button spring frame along the axis of the diacan then be easily removed from the spring phragm is equal to, longer, or less than the and replaced by a newbutton: If necessary width of the frame along the axis of the to remove the button and its springs from 15 button. By making the movement of the the casing,thiscan be easily done by loosenelectrodes greater than that of the button, ing the disk h and forcing the same and the the sound at the receiver can be magnified. plastic plug inwardly into the casing. This arrangement of the button 'Jermits the l I claim as my invention: I same to be located in the plane in which the l 1. In an electric telephone transmitter, .20 transmitter diaphragm swings, and a change lthe combination with avibratory. diain the position of the arm will therefore phragni, of a resistance varying device, 7 5 not disturb the carbon granules or cause means connecting said resistance varying areingand affect. the action of the transdevice to said diaphragm and to a fastening mitter; v post, and a body of plastic material in 25 The spring frame E being attached to the which said post is embedded and rigidly diaphragm also acts as a damper spring for held, whereby said post can be placed in the regulating the vibrations of the diaphragm, plastic material in such a position that there and this spring can be supplemented, if ncc will be no stress on the diaphragm when thecssary, by another spring G of similar charplastic material ha dens and secures the 30 acter which is arranged, as shown, at right post, substantially as set forth.

angles to the button-supporting and damper 2. In an electric telephone transmitter, spring E. This dampening. action' can be the combination with the vibratory diaregulated as required to suit different conphragnuof a resistance varying device hav- -di t-ions, by using one or more springs, or ing electrodes which are movable in a direc- 35 springs of different stiffness or shape. As tion at right angles to the axis of the diathe damper springs act on the center of the phragm, a spring which surrounds the rediaphragm they produce a uniform and consistance varying device and is connected at centric etiect uponits vibrations and give opposite sides to said electrodes, said spring much better results than damper springs being attached at one side to the diaphragm -10 which bear on the peripheral portion of the and at the opposite side to a fastening post,

diaphragm. and a body of plastic material in which said 'llie buttoii supporting and dampening post is embedded and rigidly held, whereby springs are preferably secured in the casing l said post can he placed in the plastic mateas follows: The springs are secured to a bolt rial in such position that there will be no 45 or postll which passes loosely through a stress on the diaphragm when the plastic hole in a disk h, secured by screws 7;, or. material hardens and secures the post, subotherwise, in the inner end of the casing, stantially as set forth. and is provided-with a head, nut or enlarge- Witness my hand, this 16th day of July, night h". After the diaphragm with the 1909. i

50 springs attached thereto has been secured CEORGE R ALP MORRIS iirplacc in the casing with the bolt extend- T ing through the hole in the disk 72,, the space \Vitnesses: in the inner. end of the casing around the en- C. WV. PARKER, largement of-thc bolt is filled with plaster G. B. HQBNBEGK.

Correction in Letters Patent'No. 1,03Q,915. 4.

It is hereby certified em in Letters Pate nt No. 1,030,915,. granted July 2,1912, upon the epplication 0f George Ralph-Merrie, of Bufialo,'New York, for an imbrovemeht in "TelephcneTransmittersfl an. error appears in the printed specifica tional equiring correetien as follov vs: Page 1,1lne 85, strike out the words is rigidly held at its iener side the and insert the words, reference lette i-s, and syllable with in opposite elebtrodea a a 88-; mi my the said Letters Patent sheuld be read with this correction therein that the same may eonform to the record of the'cas'e in the Phtent Ofiice. I

Signed and sealed this 23rd day of July, A; D., 1 912.

' 0. c. BILLINGS,

[emu] I Acting Commissioner of Patents. 

